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Prediction and Measurement Techniques for Radiated EMI of power Converters with cables

Chinese Journal of Electrical Engineering 2022年第4期8卷 1-10页

作者： Zhedong Ma Shuo Wang power Electronics and Electrical power Research Lab University of Florida32611 USA

Recently,radiated electromagnetic interference(EMI)has become a research hotspot in power electronics systems,as the switching frequencies of power electronics systems have increased significantly with the adoption of wide-bandgap devices.In this article,a generalized radiated EMI model for power electronics converters with power cables is first reviewed.The radiated EMI model is then developed for a flyback power converter with critical ground impedance included.Based on the developed model,accurate high-frequency parameter extraction techniques and a radiated EMI prediction technique are developed and experimentally validated.Finally,essential measurement techniques are identified and developed to accurately extract parameters for accurate EMI prediction.The effects of the resolution bandwidth of the spectrum analyzer and critical PCB ground impedance on the radiated EMI are experimentally validated.PCB’s impact on the common-mode(CM)choke’s impedance and the radiated EMI is further validated.Techniques for minimizing the undesired near-field couplings in parameter extraction are discussed.The predicted EMI properly agreed with the measured EMI in the range of 30-230 MHz based on the EN550323 m class B standard.

关键词： Radiated electromagnetic interference power converters power cables spectrum analyzer resolution bandwidth

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挤包高压直流电缆的质量控制:采用低频耐压试验检测电缆的关键缺陷(英文)

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高电压技术 2011年第11期37卷 2664-2671页

作者： Erling Ildstad Frank Mauseth Mildrid Selsjord Rolf Hegerberg Department of Electric power Engineering NTNUTrondheimNorway SINTEF Energy Research.Trondheim Norway

The main purpose of the work presented here is to evaluate different methods for quality control of polymeric insulated HVDC cables.The insight gained can be used to evaluate proposed test methods for quality assurance of long lengths of polymer insulated power cables.Laboratory experiments were performed using both Rogowski shaped test objects and model cables,insulated with XLPE containing imbedded spherically shaped particles.Tests were performed by stressing the test object with AC(50 Hz),VLF(0.1 Hz) and DC voltages and measuring time to breakdown at the different voltages.The slope of the voltage-time curve for 0.1 and 50 Hz were found to be parallel showing higher breakdown strength for 0.1 Hz than 50 Hz.The number of periods to breakdown is somewhat higher for 0.1 Hz than for 50 Hz.The breakdown strength for DC was much higher than for both AC 50 Hz and 0.1 Hz.The results indicate that the VLF test voltage needs to be 2 to 3 times higher than at 50 Hz power frequency in order to eliminate the same defects within a comparable time.

关键词： HVDC VLF power cables quality control test methods extruded insulation

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EXPERIMENTAL RESEARCHES ON LIGHTNING IMPULSE CORONA CHARACTERISTICS OF UHV CONDUCTORS

EXPERIMENTAL RESEARCHES ON LIGHTNING IMPULSE CORONA CHARACTE...

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The ⅪⅩ International Conference on Gas Discharges and Their Applications

作者： XU TAO XIE XIONGJIE YE QIMING XIE LIANG YANG PENGCHENG Electric power Research Institute

ISBN: (纸本)9771003651221

＜正＞When lightning strike occurs at transmission lines,the lightning waves go into the substations along with the transmission lines and have great harmful effect on the equipments.The proper lighting insulations could protect equipments from broken down by lighting.In China,the designs of lightning insulations often ignore the effect of impulse corona on transmission lines. As the impulse corona could lead large attenuation and distortion to the lightning waves, the margins of the traditional designs are great. For the UHV power system,the great margins will lead to much greater cost of insulations.In this paper,series experiments were carried out in China UHV AC test base and Q-V characteristics curves of UHV conductors were obtained. Lighting impulse corona empirical equation of UHV conductors is proposed.In the end of this paper,an impulse corona model based on the test results is established,which could be used in electromagnetic transient calculation software.

关键词： Transmission Lines Lightning Pulses coronas Insulation ULTRAHIGH VACUUM conducting bodies Lighting corona power cables Lightning Stroke Clinical Test Result Substations

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